Methods and devices for performing proximity discovery

Abstract

A method for use in a first user equipment (UE) includes receiving, from a base station, control information and a resource assignment for uplink transmission; and transmitting, based on the control information, a discovery signal on the assigned resource for uplink transmission, the discovery signal including a first temporary UE identifier (ID) assigned to the first UE, wherein the first temporary UE ID is used to identify the first UE for device-to-device communication.

What is claimed is: 
     
       1. A method, comprising:
 transmitting, from a first user equipment (UE) to a base station, a discovery signal transmission request; 
 receiving, at the first UE, a discovery signal grant on a physical downlink control channel (PDCCH), wherein the discovery signal grant indicates an uplink resource assignment that is transmitted on a physical downlink shared channel (PDSCH), and the uplink resource assignment indicates an uplink resource for a discovery signal; 
 determining, at the first UE, the uplink resource based on the discovery signal grant; 
 generating, at the first UE, the discovery signal by encoding a temporary device-to-device (D2D) identifier of the first UE by using at least one of a convolutional code or a Reed-Muller code; 
 transmitting, from the first UE to a second UE, the discovery signal using the uplink resource; 
 receiving, from the base station, a second temporary D2D identifier for the second UE; and 
 detecting the second temporary D2D identifier that is transmitted by the second UE. 
 
     
     
       2. The method of  claim 1 , wherein the discovery signal is transmitted using a physical uplink shared channel (PUSCH) resource block. 
     
     
       3. The method of  claim 1 , wherein the uplink resource is used to transmit discovery signals from a plurality of UEs. 
     
     
       4. The method of  claim 1 , wherein the temporary D2D identifier is multiplied with an orthogonal code of the first UE. 
     
     
       5. The method of  claim 1 , wherein the discovery signal grant includes a flag to differentiate between Format 0 and a current format of the discovery signal grant. 
     
     
       6. The method of  claim 1 , wherein the discovery signal grant includes temporary device-to-device (D2D) identifiers of a plurality of UEs that request discovery signal transmission. 
     
     
       7. A first user equipment (UE), comprising:
 at least one hardware processor; and 
 a non-transitory computer-readable storage medium coupled to the at least one hardware processor and storing programming instructions for execution by the at least one hardware processor, wherein the programming instructions instruct the at least one hardware processor to: 
 transmit, from the first UE to a base station, a discovery signal transmission request; 
 receive, at the first UE, a discovery signal grant on a physical downlink control channel (PDCCH), wherein the discovery signal grant indicates an uplink resource assignment that is transmitted on a physical downlink shared channel (PDSCH), and the uplink resource assignment indicates an uplink resource for a discovery signal; 
 determine, at the first UE, the uplink resource based on the discovery signal grant; 
 generate, at the first UE, the discovery signal by encoding a temporary device-to-device (D2D) identifier of the first UE by using at least one of a convolutional code or a Reed-Muller code; 
 transmit, from the first UE to a second UE, a discovery signal using the uplink resource; 
 receive, from the base station, a second temporary D2D identifier for the second UE; and 
 detect the second temporary D2D identifier that is transmitted by the second UE. 
 
     
     
       8. The first UE of  claim 7 , wherein the discovery signal is transmitted using a physical uplink shared channel (PUSCH) resource block. 
     
     
       9. The first UE of  claim 7 , wherein the uplink resource is used to transmit discovery signals from a plurality of UEs. 
     
     
       10. The first UE of  claim 7 , wherein the temporary D2D identifier is multiplied with an orthogonal code of the first UE. 
     
     
       11. The first UE of  claim 7 , wherein the discovery signal grant includes a flag to differentiate between Format 0 and a current format of the discovery signal grant. 
     
     
       12. The first UE of  claim 7 , wherein the discovery signal grant includes temporary device-to-device (D2D) identifiers of a plurality of UEs that request discovery signal transmission. 
     
     
       13. A non-transitory computer-readable medium storing instructions which, when executed, cause a computing device to perform operations comprising:
 transmitting, from a first user equipment (UE) to a base station, a discovery signal transmission request; 
 receiving, at the first UE, a discovery signal grant on a physical downlink control channel (PDCCH), wherein the discovery signal grant indicates an uplink resource assignment that is transmitted on a physical downlink shared channel (PDSCH), and the uplink resource assignment indicates an uplink resource for a discovery signal; 
 determining, at the first UE, the uplink resource based on the discovery signal grant; 
 generating, at the first UE, the discovery signal by encoding a temporary device-to-device (D2D) identifier of the first UE by using at least one of a convolutional code or a Reed-Muller code; 
 transmitting, from the first UE to a second UE, a discovery signal using the uplink resource; 
 receiving, from the base station, a second temporary D2D identifier for the second UE; and 
 detecting the second temporary D2D identifier that is transmitted by the second UE. 
 
     
     
       14. The non-transitory computer-readable medium of  claim 13 , wherein the discovery signal is transmitted using a physical uplink shared channel (PUSCH) resource block.